Assessment of the impact of the electrical stress on the ageing for a HVDC model cable
Résumé
The objective of this study is to investigate the impact of thermoelectric stress compared to thermal stress on the properties of HVDC model cables. To do so, electrical andphysico-chemical characterizations have been performed as a function of ageing time that extends over several months. Electrical characterizations show that thethermoelectric ageing tends to decrease the conductivity compared to the thermal ageing. The same conclusion holds for space charge, where more charges areobserved during characterization for a thermally aged cable, compared to an electro-thermally stressed one. Physico-chemical characterizations do not showsignificant differences between thermoelectric and thermal ageing. Both ageing conditions show an increase of the carbonyl index with ageing time.
Domaines
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